 flukes
Hi there I am new and a koi keeper for app 2 years. my fish have been absolutely fine until last week. my white chagoi went a lilac colour and died.
Checked the water PH ammonia etc 7.5 and zero Other fish started jumping and flashing, took advice from Brighouse Koi store and put Fluke M in water. checked readings again. checked tap water reading 7.5. My big boy is swimming as normal, not feeding, and has now a tendency to half roll to one side. any suggestions what else I can do or what the cause may be the pond is app 4500 gallons, changed uv filter bulb. I am so desperate not to lose him. Another indication is that his vibrant red has changed to a paler orange. Any help would be greatly appreciated. | 
